I've never used the bus pirate or logic analyzer before but your video explains it all very well. One of the best I've seen in a while. Great job!
@eclipse90283 жыл бұрын
Thanks! I will do the same, but also translate into Russian and change a bit) You have done really great and quiete hard job for us, your dear subscribes!!!
@virdox2 жыл бұрын
Привет. Если Вы повторили этот проект, можем ли мы немного пообщаться на эту тему ?
@eclipse90282 жыл бұрын
@@virdox да, конкретнее?
@virdox2 жыл бұрын
@@eclipse9028 интересует подобный приборчик, для дел автосервисных. Правда, для давлений чуть по-больше, до 50 - 100 Бар. И не будучи специалистом в этом направлении - ищу другие решения, от людей кто "в теме" ...
@billybbob183 жыл бұрын
This is a very clean project. I like to graph the data to a 320x240 LCD. I've been waiting for a differential pressure sensor with a 24 bit ADC with a range within -+ 2PSI for an HVAC device i plan to build. Upon doing the math for your sensor, 24psi / 2^24 equates to just over 1 millionth of a PSI precision. Is my math incorrect? You might have better signal quality by using a battery to power it. USB is notoriously noisy. AC adapters vary in quality in ways your multimeter can't detect. You can also use a running average for slightly slower updates but with more stable readings. I was getting stable readings with the SM5852 differential pressure sensor down to 1/10,000 of an inch of water column (with only 12bits) by using running average. I cant even imagine what a 24bit ADC would do on the same sensor.
@rodstartube4 жыл бұрын
A simple enhancement: in the negative range, the graph bar should increase from right to left
@ICStation20137 жыл бұрын
Thanks for your quite awesome project, appreciate it~
@franklister74264 жыл бұрын
This is really cool. I am inspired to try to create a project with two sensors and display the difference between the two. Any suggestions. I clicked the link for the sensor breakout board (above) and the page was not found. Thank for the cool ideas and terrific explanation of the data sheets and your project
@swharden4 жыл бұрын
Check out sparkfun! Since I posted this video they have breakout boards for pressure sensors like LPS25HB www.sparkfun.com/products/14767
@franklister74264 жыл бұрын
@@swharden I was reading your code in the section "Code to pull a 24-bit pressure sensor reading:" on swharden.com/wp/2017-04-29-precision-pressure-meter-project/. You might want to go back and check your spelling: pressure=0; pressure+=data[0]; // pull in a byte pressure=pressure
@swharden4 жыл бұрын
@@franklister7426haha! good catch =]
@vanderchicken31417 жыл бұрын
How are you getting measurements up to 24 PSI over atmosphere? This sensor's datasheet says it's only good to 1200mbar absolute, which is at most a few PSI over sea level?
@franklister74264 жыл бұрын
Do you have a wiring diagram? I can't seem to figure out how you connected the display to the ATmega
@swharden4 жыл бұрын
The display is definitely the most complicated part about the software and the wiring. The sensor is easy in comparison. github.com/swharden/AVR-projects/blob/master/ATMega328%202017-03-19%20i2c%20LCD%20pressure%20sensor/schematics/atmega8_lcdpcf8574_sample.png
@sumdcomputer4 жыл бұрын
I need to measure negative pressure, any suggestion?Iwant to measure the soil moisture tension (negative pressure) for soil moisture content measurement. (soil tensiometer)
@swharden4 жыл бұрын
Yeah, this will work for you. There is not really such a thing as negative pressure. A vacuum is 0PSI (0 Bar), and anything with more air molecules than a vacuum will have a positive pressure reading. "Negative" pressure usually just means < 14.4 PSI (
@bait2339 Жыл бұрын
Plase help make me coding with sensor mpx5700ap with nodemcu esp8266
@carnagelive35444 жыл бұрын
Would you be able to build something similar but receive those readings wirelessly?
@swharden4 жыл бұрын
Yes! There are lots of little wireless modules and bluetooth modules on ebay and amazon you may find helpful
@jjglasair4 жыл бұрын
I Can't find tnhe sensor breakout any more. ICS does not have it on its site Do you have an alternate supplier
@swharden4 жыл бұрын
It looks like it's currently on Amazon www.amazon.com/dp/B07Q7PLPNT
@jjglasair4 жыл бұрын
@@swharden Thanks a lot Scott
@franklister74264 жыл бұрын
What Epoxy did you use? I used Loctite Epoxy / Plastic and when it cured it did not bond to the syringe so air will pass between the Epoxy and the syringe. In fact, with enough pressure, the cured epoxy can be pushed out of the syringe.
@swharden4 жыл бұрын
I used Gorilla Glue Epoxy. It bonded well to the polypropylene syringe and cured very hard.
@franklister74264 жыл бұрын
When you add/subtract pressure with your 2nd syringe, do you loose pressure on your probe? When I apply a constant pressure to my probe, the pressure slowly bleads off. I loose about 1/2 atmosphere over 5 minutes. It was worse one my first probe, I am guessing there was air escaping from the sheath on the CAT5 cable. When I stripped back the sheath so that only the shielded wires passed through the rubber plunger and the sheath was imbedded in the epoxy, then it worked a lot better, but still have a pressure loss. I even super glued the connecting hose to the syringe. Any suggestions? Any change that you could make a video on making the probes :) Thanks
@swharden4 жыл бұрын
@@franklister7426 Maybe use a hard-setting epoxy to ensure it's air-tight? Perhaps paint your syringe with clear nail polish to ensure all the junctions are truly sealed? Also, if you are applying pressure with a second syringe, maybe it's the second syringe that is not air-tight.
@franklister74264 жыл бұрын
@@swharden Thank you, I will give that a try :)
@GregdEntremont4 жыл бұрын
Nice project! I'm trying to find a manometer to measure a differential pressure of 0.5 inches of water (0.125 kPa), but none of the devices I can find have that precision. Have you seen other devices that do this?
@billybbob183 жыл бұрын
That's low! I have a vid on my channel of an SM5852 diff press sensor. I was able to get precision to 1/10,000 inchH2O by using a fast running average to smooth out the data. You can find other sensors these days that go to +-0.250kPa. I'm afraid you might have to wait for a 0.125kPa version.
@rfpaintworkz08095 жыл бұрын
does the maksimum psi only 23 or it depends on the tube?
@swharden5 жыл бұрын
Hi Rafi, the link in the description (project page) has a link to the datasheet. The datasheet says "Operating range: 10 to 1200 mbar" (1200 mbar is about 17.5 PSI). However, it's easy to find similar modules which measure much higher pressures. I intentionally got a low pressure one because I only intended to measure 0-3 PSI.
@vgossio19664 жыл бұрын
I need to know if you can help me to make a project
@swharden4 жыл бұрын
maybe
@vgossio19664 жыл бұрын
@@swharden can you make a wireless precision sensor from. 0 to 5 psi?
@swharden4 жыл бұрын
Yes. Pressure sensor modules are cheap and common, as are bluetooth modules and other wireless modules for small electronics projects
@felixcat43465 жыл бұрын
It seems you slipped in a commercial here and there, so thumbs down for you.
@swharden5 жыл бұрын
If I really enjoy a product, I try to mention where I got it from so others who may be interested in it will know where they can get one too. This is especially true for individual vendors or startup companies. Highlighting the sources of indie hardware products I enjoy using is an important way I try to give back to the maker community.